Polysiloxane based fuser member containing zirconium silicate and a silicon T-resin

Abstract

A material for coating an imaging member comprising: a crosslinked poly(dialkylsiloxane), zirconium silicate and optional T-resin.

What is claimed is:  
     
       1. A material for coating an imaging member comprising: a cross linkable poly(dialkylsiloxane), zirconium silicate and optional Silicon T-resin. 
     
     
       2. The material of claim  1  wherein the poly(dialkylsiloxane) has a weight-average molecular weight before crosslinking of about 5,000 to 80,000. 
     
     
       3. The material according to claim  1  wherein zirconium silicate is present in an amount from 10 to 150 weight parts per 100 weight parts of cross linkable poly(dialkylsiloxane). 
     
     
       4. The material according to claim  1  further comprising an aryl silane crosslinking agent. 
     
     
       5. The material according to claim  4  wherein the aryl silane crosslinking agent has a general formula selected from 
       R 1   n Si(OR 2 ) 4−n ;  
       R 1   n R 3   m Si(OR 2 ) 4−n−m ; or  
       R 1   n SiX 4−n    
       where 
       R 1  is aryl and  
       R 2  and R 3  are independently aryl or alkyl,  
       X is a halide or hydrogen, and  
       n and m are integers such that their sum is less than 4 and greater than zero, and when either m is zero or m is one or more and R 3  is alkyl, the value of n should be at least one.  
     
     
       6. The material according to claim  1  wherein the cross linkable poly(dialkylsiloxane) is poly(dimethylsiloxane). 
     
     
       7. The material according to claim  1  wherein the cross linkable poly(dialkylsiloxane is an (alpha-omega-hydroxy-) poly(dialkylsiloxane) with the general structure                    
       where 1 is an integer; R 3  and R 4  are independently alkyl having 1-6 carbon atoms. 
     
     
       8. The material according to claim  1  wherein the Silicon T-resin has the empirical formula RSiO 1.5  where R is an alkyl or aryl group. 
     
     
       9. The material according to claim  1  wherein the zirconium silicate has an average particle size from 1 to 5 microns. 
     
     
       10. The material according to claim  1  wherein the silicone T-resin is present in an amount from 26 to 100 weight parts per 100 weight parts of cross linkable poly(dialkylsiloxane). 
     
     
       11. The material according to claim  1  wherein the aryl silane crosslinking agent is present in an amount of 5 to 50 weight parts per 100 weight parts of cross linkable poly(dialkylsiloxane). 
     
     
       12. An imaging member comprising a core and an outer layer formed on an outer surface of the core, the layer comprising the material according to claim  1 . 
     
     
       13. The imaging member according to claim  12  further comprising an oil barrier layer disposed between the core and the outer layer. 
     
     
       14. The imaging member according to claim  13  further including a cushion layer disposed between the oil barrier layer and the core. 
     
     
       15. The imaging member according to claim  12  further including a cushion layer disposed between the core and the outer layer. 
     
     
       16. The imaging member according to claim  12  being a fusing roller. 
     
     
       17. The imaging member according to claim  12  being a pressure roller.